A new series of niobates A6n* [Bxm+Nb12-x]Nb4O42(A = K, Ba; B = Ni, Cr, Fe, Ti and Zr) has been synthesizedrnby solid state reaction and the flux method. The morphology, optical properties and chemical stability of the newrncompounds were studied. The composition of the compounds were determined by chemical analyses and electronrnprobe X-ray microanalysis(EPMA). The results of X-ray powder diffraction(XRPD) analyses confirmed that therncompounds crystallized in the hexagonal system with space group P63/mcm(193), and which are isostructure withrnK6CrNb15O42. X-ray powder diffraction lines for these compounds were well indexed.
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